Abstract
In the present study, amorphous titanium dioxide (TiO2) nanotubes were synthesized by one-step anodization technique and subsequently annealed in different environments to investigate the effect of annealing atmospheres on the formation of different crystalline phases. X-ray Diffraction (XRD) patterns clearly showed the presence of anatase TiO2 phase with various crystallite sizes. The samples annealed in oxygen and air atmospheres at 500 °C showed a dominant anatase phase and a small amount of rutile phase, on the other hand, the samples annealed in nitrogen and argon atmospheres and in a vacuum at 500 °C contained the anatase phase only. XPS analysis of the samples showed a broadening in the binding energy curves with respect to variation in annealing atmosphere, confirming the variation in surface defects, which in turn affect photocatalytic degradation. The vacuum-annealed sample showed superior photocatalytic degradation efficiency as it had relatively higher pseudo-first order rate constants (k) of 0.009/ min.
| Original language | English |
|---|---|
| Pages (from-to) | 8908-8912 |
| Number of pages | 5 |
| Journal | Journal of Nanoscience and Nanotechnology |
| Volume | 12 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2012 Dec 1 |
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Keywords
- Anodization
- Photocatalysis
- Surface defect
- TiO nanotube
ASJC Scopus subject areas
- Condensed Matter Physics
- Chemistry(all)
- Materials Science(all)
- Bioengineering
- Biomedical Engineering
Cite this
Effect of annealing environments on self-organized TiO2 nanotubes for efficient photocatalytic applications. / Hyam, Rajeshkumar Shankar; Lee, Jongseok; Cho, Eunju; Khim, Jeehyeong; Lee, Haigun.
In: Journal of Nanoscience and Nanotechnology, Vol. 12, No. 12, 01.12.2012, p. 8908-8912.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of annealing environments on self-organized TiO2 nanotubes for efficient photocatalytic applications
AU - Hyam, Rajeshkumar Shankar
AU - Lee, Jongseok
AU - Cho, Eunju
AU - Khim, Jeehyeong
AU - Lee, Haigun
PY - 2012/12/1
Y1 - 2012/12/1
N2 - In the present study, amorphous titanium dioxide (TiO2) nanotubes were synthesized by one-step anodization technique and subsequently annealed in different environments to investigate the effect of annealing atmospheres on the formation of different crystalline phases. X-ray Diffraction (XRD) patterns clearly showed the presence of anatase TiO2 phase with various crystallite sizes. The samples annealed in oxygen and air atmospheres at 500 °C showed a dominant anatase phase and a small amount of rutile phase, on the other hand, the samples annealed in nitrogen and argon atmospheres and in a vacuum at 500 °C contained the anatase phase only. XPS analysis of the samples showed a broadening in the binding energy curves with respect to variation in annealing atmosphere, confirming the variation in surface defects, which in turn affect photocatalytic degradation. The vacuum-annealed sample showed superior photocatalytic degradation efficiency as it had relatively higher pseudo-first order rate constants (k) of 0.009/ min.
AB - In the present study, amorphous titanium dioxide (TiO2) nanotubes were synthesized by one-step anodization technique and subsequently annealed in different environments to investigate the effect of annealing atmospheres on the formation of different crystalline phases. X-ray Diffraction (XRD) patterns clearly showed the presence of anatase TiO2 phase with various crystallite sizes. The samples annealed in oxygen and air atmospheres at 500 °C showed a dominant anatase phase and a small amount of rutile phase, on the other hand, the samples annealed in nitrogen and argon atmospheres and in a vacuum at 500 °C contained the anatase phase only. XPS analysis of the samples showed a broadening in the binding energy curves with respect to variation in annealing atmosphere, confirming the variation in surface defects, which in turn affect photocatalytic degradation. The vacuum-annealed sample showed superior photocatalytic degradation efficiency as it had relatively higher pseudo-first order rate constants (k) of 0.009/ min.
KW - Anodization
KW - Photocatalysis
KW - Surface defect
KW - TiO nanotube
UR - http://www.scopus.com/inward/record.url?scp=84876213429&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84876213429&partnerID=8YFLogxK
U2 - 10.1166/jnn.2012.6734
DO - 10.1166/jnn.2012.6734
M3 - Article
VL - 12
SP - 8908
EP - 8912
JO - Journal of Nanoscience and Nanotechnology
JF - Journal of Nanoscience and Nanotechnology
SN - 1533-4880
IS - 12
ER -